A hierarchical Co₃O₄-Bi₂O₃ composite was first prepared via an adsoption-calcination method using a bismuth-based MOF (Bi-BTC) as the precursor and substrate. In the composite, Co₃O₄ nanoparticles are loaded on the outer layer of Bi₂O₃ rods derived from Bi-BTC and show a uniform honeycomb-like morphology. In dyes degradation tests, the Co₃O₄-Bi₂O₃ composite exhibits much better peroxymonosulfate (PMS) activation performance in RhB degradation than pure Bi₂O₃ or Co₃O₄. The Co₃O₄-Bi₂O₃/PMS system also shows high performance for various azo dyes and maintains good catalytic performance at wide pH range. Besides, the good chemical stability of Co₃O₄-Bi₂O₃ ensures it good reusability in four recycling tests. XPS and electrochemical analysis indicate the interaction of Bi species promotes the activation capacity of Co₃O₄ nanoparticles. The results of radicals quenching tests and ESR analysis reveal the singlet oxygen and superoxide radicals are the dominant functional radical species in Co₃O₄-Bi₂O₃/PMS system and subsequently a reasonable activation mechanism is proposed.

首先，采用基于铋的MOF（Bi-BTC）作为前体和底物，通过吸附-煅烧方法制备了分层的Co ₃ O ₄ -Bi ₂ O ₃复合材料。在复合材料中，Co ₃ O ₄纳米颗粒负载在源自Bi-BTC的Bi ₂ O ₃棒的外层上，并显示出均匀的蜂窝状形态。在染料降解测试中，与纯Bi ₂ O ₃或Co ₃相比，Co ₃ O ₄ -Bi ₂ O ₃复合物在RhB降解中表现出更好的过氧单硫酸盐（PMS）活化性能。O ₄。Co ₃ O ₄ -Bi ₂ O ₃ / PMS系统还对多种偶氮染料显示出高性能，并在宽pH范围内保持良好的催化性能。此外，Co ₃ O ₄ -Bi ₂ O ₃的良好化学稳定性确保了其在四个循环测试中的良好可重复使用性。XPS和电化学分析表明Bi物种的相互作用促进了Co ₃ O ₄纳米颗粒的活化能力。自由基猝灭测试和ESR分析的结果表明，单线态氧和超氧化物自由基是Co ₃ O中主要的功能自由基_提出了4- Bi ₂ O ₃ / PMS系统，并提出了合理的活化机理。